Can topological defects mimic the BICEP2 B-mode signal?

Abstract

We show that the B-mode polarization signal detected at low multipoles by BICEP2 cannot be entirely due to topological defects. This would be incompatible with the high-multipole B-mode polarization data and also with existing temperature anisotropy data. Adding cosmic strings to a model with tensors, we find that B-modes on their own provide a comparable limit on the defects to that already coming from Planck satellite temperature data. We note that strings at this limit give a modest improvement to the best-fit of the B-mode data, at a somewhat lower tensor-to-scalar ratio of $r\simeq 0.15$.

arXiv comment3 pages, 4 figures; Minor changes, matches published version

References in corpus (20)

• Cosmic strings
• The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectra
• The number of cosmic string loops
• Cosmic Strings and Superstrings
• Cosmic Structure Formation with Topological Defects
• Fitting CMB data with cosmic strings and inflation
• Bounds on Cosmic Strings from WMAP and SDSS
• Cosmic microwave background anisotropy from wiggly strings
• Updated constraints on the cosmic string tension
• Signals of Inflationary Models with Cosmic Strings
• CMB power spectra from cosmic strings: predictions for the Planck satellite and beyond
• CMB polarization power spectra contributions from a network of cosmic strings
• B-modes from Cosmic Strings
• B polarization of cosmic microwave background as a tracer of strings
• Unified model for vortex-string network evolution
• Cosmic microwave anisotropies from BPS semilocal strings
• Cosmic string parameter constraints and model analysis using small scale Cosmic Microwave Background data
• Constraints on the fundamental string coupling from B-mode experiments
• Detecting and distinguishing topological defects in future data from the CMBPol satellite
• On the degeneracy between primordial tensor modes and cosmic strings in future CMB data from Planck

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